Multi-tap distribution apparatus

Abstract

There is provided a distribution apparatus in which transmission losses at the connections between ends of transmission lines and input and output terminals of a mother board are reduced. These ends of the transmission lines are positioned on resin support pieces. A resin support piece (19) is provided at a dead end of each groove (6a) formed in a housing (1). An end portion of a metal rod (6b) is placed on the support piece (19). The end portion of the rod (6b) has a threaded hole (20) formed therethrough. The mother board (11) is provided with two first lands (22,23) each surrounding a screw hole (21). A screw (22a) is tightened in each threaded hole (20), which is part of a main line connection terminal (5b), thereby bringing the head of the screw (22a) into firm contact with the first land (22) and establishing an electrical connection between the first land (22) and the conductive rod (6b). Provided outside each of the first land (22) is a circular and concentric second land (23) with a portion cut out of it. The second land (23) is insulated from the first land (22) and electrically connected to the housing (1) via contact pieces (23a) projected from the rear surface of the mother board (11).

I claim: 
     
       1. A distribution apparatus for being interposed in a transmission cable, said distribution apparatus comprising, a built-in mother board disposed in the approximate center of a case, said mother board including,   a branch circuit for distributing as output signals high-frequency signals received at an input terminal of said mother board, and   a current transmission circuit for allowing currents to be transmitted between said input terminal and an output terminal of said mother board,   transmission lines for electrically connecting said input and output terminals of said mother board to cable connecting portions provided on sides of said case, said transmission lines each having a center conductor with a threaded hole formed in one end thereof,   each of the central conductors of each of said transmission lines is disposed in a groove formed in an inner wall of said case without being in contact with said inner wall, and a structure for connecting each of said central conductors to said mother board is assembled at a dead end of the groove, and   lands provided around through-holes which are formed in said mother board and through which electrically conductive screws are inserted,   wherein said screws are tightened into said threaded holes through said through-holes so that electrical connections are established between said transmission lines and said input and output terminals of said mother board via said screws.   
     
     
       2. The distribution apparatus in accordance with claim 1 wherein at least three cable connecting portions are provided so that two cable connecting portions are selectable from said at least three cable connecting portions for connection to said mother board.